--- a/clear_cmd.c	Tue Sep 05 23:11:41 2006 +0000
+++ b/clear_cmd.c	Tue Sep 05 23:21:41 2006 +0000
@@ -729,7 +729,7 @@
 				SetClearGroundDensity(tile, CLEAR_ROCKS, 3);
 				do {
 					if (--j == 0) goto get_out;
-					tile_new = tile + TileOffsByDir(GB(Random(), 0, 2));
+					tile_new = tile + TileOffsByDiagDir(GB(Random(), 0, 2));
 				} while (!IsTileType(tile_new, MP_CLEAR) || IsClearGround(tile_new, CLEAR_DESERT));
 				tile = tile_new;
 			}